How do I go about getting my money back for this game?

Yeah so I bought this game when it came out for Linux. It worked for about 2 weeks then the update you guys did broke it and it hasnt worked since.
Game installs, and starts up fine, but when I join a server when it gets to the precaching part it just crashes to the desktop everytime...never fails.
I would like to get my money back and I would suggest you guys dont bother making games on linux anymore, you obviously dont know how.